Debian 'Stretch' on my production NAS (TS-569 Pro), with the backup NAS (TS-559 Pro+) to eventually follow. When that happens, I'll no longer use or support any QNAP firmware. Debian powerup/poweroff times are < 1 minute.

Current version of QTS SSL Certificate package in the App Center is 2.1.12.

I wonder if QNAP have removed a previously posted later version? After yours was upgraded?

Even then, yours shouldn’t be trying to install an earlier version automatically.

Suggest you uninstall your current QTS SSL Certificate package, then install the 2.1.12 version from the App Center.

Debian 'Stretch' on my production NAS (TS-569 Pro), with the backup NAS (TS-559 Pro+) to eventually follow. When that happens, I'll no longer use or support any QNAP firmware. Debian powerup/poweroff times are < 1 minute.

Debian 'Stretch' on my production NAS (TS-569 Pro), with the backup NAS (TS-559 Pro+) to eventually follow. When that happens, I'll no longer use or support any QNAP firmware. Debian powerup/poweroff times are < 1 minute.